Mach 3 2010. Sometimes I machine parts that are high on my table up on top of a vice etc. On this, during the first tool change, the tool, on its way down to the fixed plate, will time out and just bump as if its hit the plate (but it hasn't)  but its 50mm or so too high. Kind of like as if its timed out. If I raise the fixed plate 80mm or so its fine but thats a pain. Because I dont find out until it happens.

Does anyone know how to change this or stop the Z from doing this?